Fix alignment option parser (PR90684)

Fix alignment option parser (PR90684)

Fix the alignment option parser to always allow up to 4 alignments.
Now -falign-functions=16:8:8:8 no longer reports an error.

    gcc/
	PR driver/90684
	* opts.c (parse_and_check_align_values): Allow 4 alignment values.
M    gcc/ChangeLog
M    gcc/opts.c

From-SVN: r271864